Ushiro Karate (Shindoryu Karetedo) not only has throws and locks that are very similar to high quality Aikido waza, but the throws are done full speed on hard wood floors, so that they learn very good ukemi. Many Aikidoka and Judoka learn bad ukemi habits that would not have bad results on hard surfaces.

Last month, I was in Japan at a special training camp with Ushiro Sensei and his son and I went at each other all out, throwing each other (including sacrifice throws) onto hard wood floors. None of us got any bruises. Hard surfaces let you really know how your ukemi is!